The X-ray structure of photosystem II reveals a novel electron transport pathway between P680, cytochrome b559 and the energy-quenching cation, ChlZ +

Sergej Vasil'ev, Gary W Brudvig, Doug Bruce

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

When water oxidation by photosystem II (PSII) is impaired, an oxidized chlorophyll (ChlZ +) is formed that quenches excitation and may prevent photodamage. Both the identification of this Chl+ and the mechanism of its oxidation and reduction are controversial. Using the available X-ray structures of PSII we calculated the efficiency of two proposed quenchers, ChlZ +(D1) and ChlZ +(D2). Of these two, only ChlZ +(D1) can quench to the degree observed experimentally. We also identify a chain of closely spaced pigments in the structure from Thermosynechococcus vulcanus that we propose to form a novel electron transport pathway between ChlZ(D1), β-carotene, P680+ and cytochrome b559.

Original languageEnglish
Pages (from-to)159-163
Number of pages5
JournalFEBS Letters
Volume543
Issue number1-3
DOIs
Publication statusPublished - May 22 2003

Fingerprint

Photosystem II Protein Complex
Electron Transport
Cations
Quenching
X-Rays
X rays
Oxidation
Carotenoids
Chlorophyll
Pigments
Oxidation-Reduction
Water
cytochrome b559

Keywords

  • Chlorophyll fluorescence
  • Electron transport
  • Excitation energy transfer
  • Non-photochemical quenching
  • Photosynthesis

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

The X-ray structure of photosystem II reveals a novel electron transport pathway between P680, cytochrome b559 and the energy-quenching cation, ChlZ + . / Vasil'ev, Sergej; Brudvig, Gary W; Bruce, Doug.

In: FEBS Letters, Vol. 543, No. 1-3, 22.05.2003, p. 159-163.

Research output: Contribution to journalArticle

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